Exhaust heat utilizing refrigeration system

ABSTRACT

There is provided an exhaust-heat using refrigerating system which can add the function of refrigerant heater, condenser or super-cooler by using exhaust heat. The system comprises a heat pump apparatus  1  equipped with a compressor 12, a first heat exchanger  14,  a pressure-reducing device  15  and a second heat exchanger  21,  and an absorption type refrigerating machine  5  equipped with a regenerator  51  using exhaust heat as a heat source, a condenser  53,  an evaporator 54 and an absorber  55.  A third heat exchanger  17  is connected to the first heat exchanger  14  in parallel, and the heat source of the third heat exchanger  17  is achieved from the evaporator 54 of the absorption type refrigerating machine.

TECHNICAL FIELD

The present invention relates to an exhaust heat using refrigeratingsystem suitably used for a show case, an air conditioner or the like.

BACKGROUND ART

There is generally known an air conditioner comprising a heat pumpapparatus having a compressor, a condenser, a pressure-reducing deviceand an evaporator.

In this type of air conditioner, the evaporator and the condenser arefrequently designed to be of air-cooling type. When they are ofair-cooling type, sufficient evaporating temperature cannot be achievedin an evaporator disposed outdoors under heating operation at a lowoutside temperature, so that there is a problem that COP (Coefficient ofPerformance) is remarkably reduced. In order to solve this problem,there has been hitherto proposed an air condition in which a refrigerantheater such as a burner or the like is disposed and COP is increased byheating refrigerant. Furthermore, there has been also proposed anotherair conditioner in which a super-cooler is equipped to increase COPunder cooling operation.

However, both the cases need heat source equipment, which increases notonly the initial cost, but also the running cost because a burner or thelike needs combustion heat of fossil fuel.

Therefore, an object of the present invention is to provide anexhaust-heat using refrigerating system which can add the function of arefrigerant heater or super-cooler not by using any burner or the like,but by using exhaust heat.

DISCLOSURE OF THE INVENTION

The present invention is characterized by comprising a heat pumpapparatus equipped a compressor, a first heat exchanger, apressure-reducing device and a second heat exchanger, and an absorptiontype refrigerating machine equipped with a regenerator using exhaustheat as a heat source, a condenser, an evaporator and an absorber,wherein a third heat exchanger is connected to the first heat exchangerin parallel, and a heat source of the third heat exchanger is achievedfrom the evaporator of the absorption type refrigerating machine.

The present invention is characterized by comprising a heat pumpapparatus equipped with a compressor, a first heat exchanger, apressure-reducing device and a second heat exchanger, and an absorptiontype refrigerating machine equipped with a regenerator using exhaustheat as a heat source, a condenser, an evaporator and an absorber,wherein a third heat exchanger is connected to the first heat exchangerin series, and a heat source of the third heat exchanger is achievedfrom the evaporator of the absorption type refrigerating machine.

The present invention is characterized by comprising an electricgenerator, a micro gas turbine for driving the electric generator, aheat pump apparatus equipped with a compressor driven by electric powerof the electric generator, a first heat exchanger, a pressure-reducingdevice and a second heat exchanger, and an absorption type refrigeratingmachine equipped with a regenerator using exhaust heat of the micro gasturbine as a heat source, a condenser, an evaporator and an absorber,wherein a third heat exchanger is connected to the first heat exchangerin parallel and a heat source of the third heat exchanger is achievedfrom the evaporator of the absorption type refrigerating machine.

The present invention is characterized by comprising an electricgenerator, a micro gas turbine for driving the electric generator, aheat pump apparatus equipped with a compressor driven by electric powerof the electric generator, a first heat exchanger, a pressure-reducingdevice and a second heat exchanger, and an absorption type refrigeratingmachine equipped with a regenerator using exhaust heat of the micro gasturbine as a heat source, a condenser, an evaporator and an absorber,wherein a third heat exchanger is connected to the first heat exchangerin series and a heat source of the third heat exchanger is achieved fromthe evaporator of the absorption type refrigerating machine.

The present invention is characterized in that the regenerator of theabsorption type refrigerating machine is disposed in a flue throughwhich exhaust heat passes.

The present invention is characterized in that a liquid pipe isconnected between the third heat exchanger and the evaporator of theabsorption type refrigerating machine and water or antifreeze liquid iscirculated to achieve the heat source of the third heat exchanger fromthe evaporator of the absorption type refrigerating machine.

The present invention is characterized is characterized in that a liquidpipe is connected between the third heat exchanger and the evaporator ofthe absorption type refrigerating machine, a water heater using exhaustheat is equipped, a liquid pipe is connected between the water heaterand the third heat exchanger and water or antifreeze liquid iscirculated to achieve the heat source of the third heat exchanger fromthe evaporator of the absorption type refrigerating machine or the waterheater.

The present invention is characterized in that both the regenerator ofthe absorption type refrigerating machine and the water heater using theexhaust heat are disposed in a flue through which exhaust heat passes.

The present invention is characterized by comprising a heat pumpapparatus equipped a compressor, a first heat exchanger, apressure-reducing device and a second heat exchanger, and an absorptiontype refrigerating machine equipped with a regenerator using exhaustheat as a heat source, a condenser, an evaporator and an absorber,wherein the evaporator of the absorption type refrigerating machine isconnected to the first heat exchanger in parallel.

The present invention is characterized by comprising a heat pumpapparatus equipped a compressor, a first heat exchanger, apressure-reducing device and a second heat exchanger, and an absorptiontype refrigerating machine equipped with a regenerator using exhaustheat as a heat source, a condenser, an evaporator and an absorber,wherein the evaporator of the absorption type refrigerating machine isconnected to the first heat exchanger in series.

The present invention is characterized by comprising an electricgenerator, a micro gas turbine for driving the electric generator, aheat pump apparatus equipped with a compressor driven by electric powerof the electric generator, a first heat exchanger, a pressure-reducingdevice and a second heat exchanger, and an absorption type refrigeratingmachine equipped with a regenerator using exhaust heat of the micro gasturbine as a heat source, a condenser, an evaporator and an absorber,wherein the evaporator of the absorption type refrigerating machine isconnected to the first heat exchanger in parallel.

The present invention is characterized by comprising an electricgenerator, a micro gas turbine for driving the electric generator, aheat pump apparatus equipped with a compressor driven by electric powerof the electric generator, a first heat exchanger, a pressure-reducingdevice and a second heat exchanger, and an absorption type refrigeratingmachine equipped with a regenerator using exhaust heat of the micro gasturbine as a heat source, a condenser, an evaporator and an absorber,wherein the evaporator of the absorption type refrigerating machine isconnected to the first heat exchanger in series.

The present invention is characterized in that the regenerator of theabsorption type refrigerating machine is disposed in a flue throughwhich exhaust heat passes.

The present invention is characterized in that the first heat exchangeris of an air-cooling type.

The present invention is characterized in that the absorber of theabsorption type refrigerating machine is equipped with a refrigerantmixer, an absorption heat radiator and solution circulating means.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a circuit diagram showing an embodiment of an exhaust heatusing refrigerating system according to the present invention, FIG. 2 isa circuit diagram showing an absorption type refrigerating machine, FIG.3 is a circuit diagram showing another embodiment, FIG. 4 is a circuitdiagram showing another embodiment, and FIG. 5 is a circuit diagramshowing another embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiments of the present invention will be described with reference tothe accompanying drawings.

FIG. 1 is a circuit diagram showing an exhaust-heat using refrigeratingsystem. In FIG. 1, 1 represents an air conditioner (heat pumpapparatus), 3 represents an electric generator, 4 represents a micro gasturbine for driving the electric generator 3 and 5 represents anabsorption type refrigerating machine.

The air conditioner 1 comprises an outdoor unit 10 and indoor units 20.In the outdoor unit 10 are mounted a motor 11 connected to the electricgenerator 3, a compressor 12 driven by the motor 11, a four-way valve 13and an air-cooling type heat exchanger (first heat exchanger) 14 havinga fan 14B. In the indoor unit 20 are mounted a pressure-reducing device15 and an air cooling type heat exchanger (second heat exchanger) 21.

In FIG. 1, the motor 11 and the compressor 12 are illustrated as beingindependent of each other, however, they may be mounted in the samecontainer.

Furthermore, a liquid-cooling type heat exchanger (third heat exchanger)17 based on water or anti-freeze liquid is connected to the first heatexchanger 14 in parallel, and each of the heat exchangers 14, 17 isselectively used by opening/closing each of electromagnetic valves 14A,17A.

The absorption type refrigerating machine 5 comprises a regenerator 51,a separator 52, a condenser 53, an evaporator 54, an absorber 55 and asolution heat exchanger 56. The regenerator 51 is disposed in a fluethrough which exhaust gas from the micro gas turbine 4 is led, and itoperates with the exhaust heat of the micro gas turbine 4 as a heatsource. A hot water heat exchanger (water heater) 27 is disposed in theflue 25, and water or antifreeze liquid is heated by using the exhaustheat of the micro gas turbine 4 in the hot water heat exchanger 27.

The hot water heat exchanger 27 and the third heat exchanger 17 of theoutdoor unit 10 are connected to each other through liquid pipes 61, 62,and an electromagnetic valve 63 and a pump 64 are disposed in one liquidpipe 61. Furthermore, the third heat exchanger 17 and the evaporator 54of the absorption type refrigerating machine 5 are connected to eachother through liquid pipes 65, 66, and an electromagnetic valve 67 and apump 68 is disposed in one liquid pipe 65.

Next, the operation of this embodiment will be described.

Under heating operation, the four-way valve 13 of the outdoor unit 10 isswitched to the position indicated by a broken line, and one of the heatexchangers 14 and 17 arranged in parallel is selected by opening/closingthe respective electromagnetic valves 14A, 17A. When the first heatexchanger 14 is selected, the motor 11 is supplied with power from theelectric generator 3 and driven, so that the compressor 12 is driven. Atthis time, refrigerant (for example, chlorofluorocarbon) from thecompressor 12 thus driven is circulated through the indoor heatexchanger 21, the pressure-reducing device 15 and the first heatexchanger 14, and then returned to the compressor 12.

The refrigerant absorbs heat from air in the first heat exchanger 14 tobe vaporized, and then condensed in the indoor heat exchanger 21 toradiate heat, whereby the room is heated.

On the other hand, when the third heat exchanger 17 is selected, theelectromagnetic valve 63 is opened and the pump 64 is driven in order tolead the water or antifreeze liquid heated in the hot water heatexchanger 27 to the third heat exchanger 17. At this time, theelectromagnetic valve 67 is closed, and the pump 68 is stopped. When thethird heat exchanger 17 is selected, the refrigerant from the compressor12 is circulated through the indoor heat exchanger 21, thepressure-reducing device 15 and the third heat exchanger 17, and thenreturned to the compressor 12.

The refrigerant is vaporized in the third heat exchanger 17 to absorbheat, and condensed in the indoor heat exchanger 21 to radiate heat,whereby the room is heated.

Since the water or antifreeze liquid heated in the hot water heatexchanger 27 is circulated in the third heat exchanger 17, moresufficient evaporating temperature is achieved as compared with theair-cooling type first heat exchanger 14, so that COP can be enhanced.

Under cooling operation, the four-way valve 13 of the outdoor unit 10 isswitched to the position indicated by a solid line, and any one of theheat exchangers 14, 17 arranged in parallel is selected byopening/closing the respective electromagnetic valves 14A, 17A. When thefirst heat exchanger 14 is selected, the motor 11 is supplied with powerfrom the electric generator 3 to be driven, and thus the compressor 12is driven. At this time, the refrigerant (for example,chlorofluorocarbon) from the compressor 12 is circulated through thefirst heat exchanger 14, the pressure-reducing device 15 and the indoorheat exchanger 21, and then returned to the compressor 12.

The refrigerant is condensed in the first heat exchanger 14 to radiateheat, and vaporized in the indoor heat exchanger 21 to absorb heat,whereby the room is cooled.

When the third heat exchanger 17 is selected, the electromagnetic valve67 is opened and the pup 68 is driven in order to lead cold water cooledin the evaporator 54 of the absorption type refrigerating machine 5 tothe third heat exchanger 17. At this time, the electromagnetic valve 63is closed, and the pump 64 is stopped. When the third heat exchanger 17is selected, the refrigerant from the compressor 12 is circulatedthrough the third heat exchanger 17, the pressure-reducing device 15 andthe indoor heat exchanger 21, and then returned to the compressor 12.

The refrigerant is condensed in the third heat exchanger to radiateheat, and vaporized in the indoor heat exchanger 21 to absorb heat,whereby the room is cooled.

Since the water or antifreeze liquid cooled in the evaporator 54 of theabsorption type refrigerating machine 5 is circulated in the third heatexchanger 17, the condensation pressure of the refrigerant is moregreatly reduced as compared with the air-cooling type first heatexchanger 14, so that COP can be enhanced.

Next, the operation of the absorption type refrigerating machine 5 willbe described.

The absorption type refrigerating machine 5 is designed as asingle-regenerator type, and it operates with the exhaust heat of themicro gas turbine as a heat source.

As shown in FIG. 2, absorption liquid (for example, lithium bromideaqueous solution) heated in the regenerator 51 is separated intoconcentrated liquid L and water vapor V in the separator 52. The watervapor V is cooled and condensed into liquid (for example, water of 50°C.) in the condenser 53. The condensed water is vaporized, for example,at about 10° C. under vacuum of about 10 mmHg in the evaporator 54, andthe water vapor thus vaporized is fed into a refrigerant mixing absorber(refrigerant mixer) 55A constituting the absorber 55. On the other hand,the concentrated liquid L from the separator 52 is cooled in thesolution heat exchanger 56, and dropped into the refrigerant mixingabsorber 55A to absorb the water vapor passed through the evaporator 54.

The absorption liquid absorbing the water vapor is cooled in anair-cooling type absorption heat radiator 55B constituting the absorber55. A part of the absorption liquid thus cooled is circulated in a pump71, dropped into the refrigerant mixing absorber 55A to absorb the watervapor passing through the evaporator 54 again, and then fed into theair-cooling type absorption heat radiator (absorption heat radiator)55B. The absorption liquid cooled in the absorption heat radiator 55B isfinally circulated in a pump 72, cooled in the solution heat exchanger56 and then returned to the regenerator 51.

In this embodiment, since the liquid pipe is connected to the evaporator54, the water or antifreeze liquid circulated through the pump 68 iscooled at 15° C. to 25° C., and the liquid thus cooled is circulated inthe third heat exchanger 17 of the outdoor unit 10.

FIG. 3 shows another embodiment.

In the embodiment described above, the air conditioner 1 is targeted. Inthis embodiment, a showcase 100 is targeted. The show case 100 comprisesa refrigerating machine unit 10, and a main body 20.

In the refrigerating machine unit 10 are mounted a motor 11 connected toan electric generator 3, a compressor 12 driven by the motor 11, and anair-cooling type heat exchanger (first heat exchanger) 14 having a fan14B. In the main body 20 are mounted a pressure-reducing device 15 andan air-cooling type heat exchanger (second heat exchanger) 21.

A liquid-cooling type heat exchanger (third heat exchanger) 17 based onwater or antifreeze water is connected to the downstream side of thefirst heat exchanger 14 in series.

The absorption type refrigerating machine 5 comprises a regenerator 51,a separator 52, a condenser 53, an evaporator 54, an absorber 55 and asolution heat exchanger 56. The regenerator 51 is disposed in a flue 25through which exhaust gas from the micro gas turbine 4 is led, andoperates with the exhaust heat of the micro gas turbine 4 as a heatsource. The operation of the absorption type refrigerating machine 5 isthe same as described above.

The third heat exchanger 17 of the refrigerating machine unit 10 and theevaporator 54 of the absorption type refrigerating machine 5 areconnected to each other through liquid pipes 65, 66, and anelectromagnetic valve 67 and a pump 68 are disposed in one liquid pipe65.

In this embodiment, by opening the electromagnetic valve 67 and drivingthe pump 68 under cooling operation, water or antifreeze liquid cooledin the evaporator 54 of the absorption type refrigerating machine 5 iscirculated at all times in the third heat exchanger 17. Accordingly, therefrigerant is cooled by the air-cooling type first heat exchanger 14and the third heat exchanger 17, and thus sufficient super-coolingdegree of the refrigerant can be achieved, so that COP can be markedlyenhanced.

FIG. 4 shows another embodiment.

In this embodiment, the evaporator 54 of the absorption typerefrigerating machine 5 is connected to the first heat exchanger 14 ofthe out door unit 10 in parallel. The absorption type refrigeratingmachine 5 has both of a cooling function of making the evaporator 54function as a so-called cooler to cool the refrigerant led to theevaporator 54 and a heating function of making the evaporator 54function as a so-called heater to heat the refrigerant led to theevaporator 54 under the control thereof.

That is, the absorption type refrigerating machine 5 comprises anelectromagnetic valve 81 for directly leading the water vapor Vseparated in the separator 52 to the evaporator 54 with bypassing thecondenser 53, and an electromagnetic valve 82 for leading theconcentrated liquid L separated in the separator 52 to the absorber 55.The other construction is the same as described above.

Next, the operation of this embodiment will be described.

Under heating operation, electromagnetic valves 81, 82 of the absorptiontype refrigerating machine 5 are opened. The refrigerant at the airconditioner 1 side is split into the first heat exchanger 14 and theevaporator 54 of the absorption type refrigerating machine 5.

When the electrical generator 3 is driven, the regenerator 51 operateswith the exhaust heat of the micro gas turbine 4 as a heat source, andthe absorption liquid is separated into the concentrated liquid L andthe water vapor V in the separator 52. The water vapor V is passedthrough the electromagnetic valve 81 and directly led to the evaporator54 to be condensed, thereby heating the refrigerant at the airconditioner 1 side, and then it is fed as condensed liquid into theabsorber 55. On the other hand, the concentrated liquid L from theseparator 52 is passed through the electromagnetic valve 82 and thendropped into the absorber 55, in which the concentrated liquid L ismixed with the condensed water passed through the evaporator 54. Theabsorption liquid thus mixed is circulated by the pump 83, and returnedto the regenerator 51 through the solution heat exchanger 56.

In this embodiment, under heating operation, the flow of the refrigerantat the air conditioner 1 side is split into the first heat exchanger 14and the evaporator 54. Since the water vapor is condensed in theevaporator 54 and thus the refrigerant is heated, sufficient evaporatingtemperature is achieved in the evaporator 54, so that COP can beenhanced.

During cooling operation, the electromagnetic valves 81, 82 of theabsorption type refrigerating machine 5 are closed. The flow of therefrigerant at the air conditioner 1 side is split into the first heatexchanger 14 and the evaporator 54 of the absorption type refrigeratingmachine 5 as indicated by a solid line of FIG. 4. When theelectromagnetic valves 81, 82 of the absorption type refrigeratingmachine 5 are closed, the evaporator 54 functions as an originalevaporator as shown in FIG. 2, and the refrigerant led to the evaporator54 concerned is cooled. Since sufficiently lower temperature is achievedin the evaporator 54 of the absorption type refrigerating machine 5 ascompared with the air-cooling type first heat exchanger 14, thecondensation pressure of the refrigerant at the compressor side isreduced, so that COP can be enhanced.

FIG. 5 shows another embodiment.

In the embodiment shown in FIG. 4, the air conditioner 1 is targeted.However, in this embodiment, a show case 100 is targeted. The show case100 comprises a refrigerating machine unit 10 and a main body 20.

In the refrigerating machine unit 10 are mounted a motor 11 connected toan electrical generator 3, a compressor driven by the motor 11 and anair-cooling type heat exchanger (first heat exchanger) 14 having a fan14B. In the main body 20 are mounted an air-cooling type heat exchanger(second heat exchanger) 21 and a pressure-reducing device 15.

In this embodiment, a evaporator 54 of an absorption type refrigeratingmachine 5 is connected to the downstream side of the first heatexchanger 14.

The absorption type refrigerating machine comprises a regenerator 51, aseparator 52, a condenser 53, an evaporator 54, an absorber 55 and asolution heat exchanger 56. The regenerator 51 is disposed in a flue 25for leading exhaust gas from a micro gas turbine 4, and operates withthe exhaust heat of the micro gas turbine as a heat source. Theoperation of the absorption type refrigerating machine 5 is the same asdescribed above.

In this embodiment, the refrigerant at the air conditioner 1 side iscooled in the first heat exchanger 14 and further cooled in theevaporator 54, and thus sufficient super-cooling degree is achieved. Asa result, COP can be remarkably enhanced.

The present invention has been described on the basis of theembodiments, however, the present invention is not limited to theseembodiments.

INDUSTRIAL APPLICABILITY

The present invention is suitably applicable to a show case or a heatpump apparatus such as an air conditioner or the like because thefunction of a refrigerator heater, a condenser or a super-cooler can beadded by using exhaust heat.

1. An exhaust-heat using refrigerating system, characterized bycomprising: a heat pump apparatus equipped a compressor, a first heatexchanger, a pressure-reducing device and a second heat exchanger; andan absorption type refrigerating machine equipped with a regeneratorusing exhaust heat as a heat source, a condenser, an evaporator and anabsorber, wherein a third heat exchanger is connected to the first heatexchanger in parallel, and a heat source of the third heat exchanger isachieved from the evaporator of the absorption type refrigeratingmachine.
 2. An exhaust-heat using refrigerating system, characterized bycomprising: a heat pump apparatus equipped with a compressor, a firstheat exchanger, a pressure-reducing device and a second heat exchanger;and an absorption type refrigerating machine equipped with a regeneratorusing exhaust heat as a heat source, a condenser, an evaporator and anabsorber, wherein a third heat exchanger is connected to the first heatexchanger in series, and a heat source of the third heat exchanger isachieved from the evaporator of the absorption type refrigeratingmachine.
 3. An exhaust-heat using refrigerating system, characterized bycomprising: an electric generator; a micro gas turbine for driving theelectric generator; a heat pump apparatus equipped with a compressordriven by electric power of the electric generator, a first heatexchanger, a pressure-reducing device and a second heat exchanger; andan absorption type refrigerating machine equipped with a regeneratorusing exhaust heat of the micro gas turbine as a heat source, acondenser, an evaporator and an absorber, wherein a third heat exchangeris connected to the first heat exchanger in parallel and a heat sourceof the third heat exchanger is achieved from the evaporator of theabsorption type refrigerating machine.
 4. An exhaust-heat usingrefrigerating system, characterized by comprising: an electricgenerator; a micro gas turbine for driving the electric generator; aheat pump apparatus equipped with a compressor driven by electric powerof the electric generator, a first heat exchanger, a pressure-reducingdevice and a second heat exchanger; and an absorption type refrigeratingmachine equipped with a regenerator using exhaust heat of the micro gasturbine as a heat source, a condenser, an evaporator and an absorber,wherein a third heat exchanger is connected to the first heat exchangerin series and a heat source of the third heat exchanger is achieved fromthe evaporator of the absorption type refrigerating machine.
 5. Theexhaust-heat using refrigerating system according to any one of claims 1to 4, wherein the regenerator of the absorption type refrigeratingmachine is disposed in a flue through which exhaust heat passes.
 6. Theexhaust-heat using refrigerating system according to any one of claims 1to 5, wherein a liquid pipe is connected between the third heatexchanger and the evaporator of the absorption type refrigeratingmachine and water or antifreeze liquid is circulated to achieve the heatsource of the third heat exchanger from the evaporator of the absorptiontype refrigerating machine.
 7. The exhaust-heat using refrigeratingsystem according to claim 1 or 3, wherein a liquid pipe is connectedbetween the third heat exchanger and the evaporator of the absorptiontype refrigerating machine, a water heater using exhaust heat isequipped, a liquid pipe is connected between the water heater and thethird heat exchanger and water or antifreeze liquid is circulated toachieve the heat source of the third heat exchanger from the evaporatorof the absorption type refrigerating machine or the water heater.
 8. Theexhaust-heat using refrigerating system according to claim 7, whereinboth the regenerator of the absorption type refrigerating machine andthe water heater using the exhaust heat are disposed in a flue throughwhich exhaust heat passes.
 9. An exhaust-heat using refrigerating systemcharacterized by comprising: a heat pump apparatus equipped acompressor, a first heat exchanger, a pressure-reducing device and asecond heat exchanger; and an absorption type refrigerating machineequipped with a regenerator using exhaust heat as a heat source, acondenser, an evaporator and an absorber, wherein the evaporator of theabsorption type refrigerating machine is connected to the first heatexchanger in parallel.
 10. An exhaust-heat using refrigerating systemcharacterized by comprising: a heat pump apparatus equipped acompressor, a first heat exchanger, a pressure-reducing device and asecond heat exchanger; and an absorption type refrigerating machineequipped with a regenerator using exhaust heat as a heat source, acondenser, an evaporator and an absorber, wherein the evaporator of theabsorption type refrigerating machine is connected to the first heatexchanger in series.
 11. An exhaust-heat using refrigerating systemcharacterized by comprising: an electric generator; a micro gas turbinefor driving the electric generator; a heat pump apparatus equipped witha compressor driven by electric power of the electric generator, a firstheat exchanger, a pressure-reducing device and a second heat exchanger;and an absorption type refrigerating machine equipped with a regeneratorusing exhaust heat of the micro gas turbine as a heat source, acondenser, an evaporator and an absorber, wherein the evaporator of theabsorption type refrigerating machine is connected to the first heatexchanger in parallel.
 12. An exhaust-heat using refrigerating systemcharacterized by comprising: an electric generator; a micro gas turbinefor driving the electric generator; a heat pump apparatus equipped witha compressor driven by electric power of the electric generator, a firstheat exchanger, a pressure-reducing device and a second heat exchanger;and an absorption type refrigerating machine equipped with a regeneratorusing exhaust heat of the micro gas turbine as a heat source, acondenser, an evaporator and an absorber, wherein the evaporator of theabsorption type refrigerating machine is connected to the first heatexchanger in series.
 13. The exhaust-heat using refrigerating systemaccording to any one of claims 9 to 12, wherein the regenerator of theabsorption type refrigerating machine is disposed in a flue throughwhich exhaust heat passes.
 14. The exhaust-heat using refrigeratingsystem according to any one of claims 1 to 13, wherein the first heatexchanger is of an air-cooling type.
 15. The exhaust-heat usingrefrigerating system according to any one of claims 1 to 14, wherein theabsorber of the absorption type refrigerating machine is equipped with arefrigerant mixer, an absorption heat radiator and solution circulatingmeans.